Switch or cut-out for telephones and circuits.



- PATENTED AUG.'29, 1905. C. ADAMS- RANDALL- SWITCH 0R CUT-OUT FOR TELEPHONE-S AND CIRCUITS.

APPLICATION FILED SEPT. 17. 1004.

UNITED STATES PATENT orrron.

CHARLES ADAMS-RANDALL, OF NEW YORK, N. Y.

SWITCH OR CUT-OUT FOR TELEPHONES AND CIRCUITS.

Specification of Letters Patent.

Patented Aug. 29, 1905.

Application filed September 17, 1904- Serial No. 224,825.

To all whom it Wmy concern:

Be it known that I, CHARLES ADAMs-RAN- DALL, a citizen of the United States, residing at New York city, in the county of New York and State of New York, have invented new and useful Improvements in Switches or Cut Outs for Telephones and Circuits, of Which the following is a specification.

This invention relates to an improved switch or cut-out for telephones and circuits connected therewith.

In the use of power-transmitters or when telephoning over long, difiicult, or cable circuits if the receiver is directly in the main line when speaking or using the same the noises or side tones in the receiver are very loud, deafening, harsh, and disturbing at the sending end of the circuit, which causes violent confusing vibrations of the tympanum of the car, which are hurtful at times, thus rendering the ear insensitive to the reception of com aratively feeble or low tones arriving from t e distant transmitter. These disturbing noises and inconveniences to the tympanum also cause the speaker or user of the telephone to fear or hesitate to speak loudly or with proper energyinto the transmitter when sending, and as a result the transmission is often imperfect and unsatisfactory.

This invention has for its object mainly the prevention of side tones or disturbing noises in the receiver when telephoning over long or difiicult circuits or when using a power transmitter or transmitters having a current of comparatively great energy, whereby the listener at the receiver is assured of the best possible conditions for receiving the comparatively low tones of telephonic speech without the least disturbance by violent action of the receiver when speaking and also encouraging anoperator in sendin messages to enunciate distinctly and witli sufiicient tone volume into the transmitter.

In addition to overcoming the defects arising from disturbing noises in the receiver a still further object of the invention incidental to the main object is to cut out of the circuit unnecessary resistance.

With these and other objects and advantages in view the invention consists generally in the use of a compound switch adapted and arranged to cut into the line the receiver only when in receiving position or use and at the same time to cut out of the line the resistance of the induction coil or coils required when sending and also to cut out or off the localbattery circuit and the transmitter or microphone and in the second or sending position to simultaneously cut in the line-circuit and the induction coil or coils and the local-battery circuit and the transmitter and cut out the receiver when sending or speakin so that there are no side tones, no matter what power of current is being used or how loudly the sender may speak, and when receiving, the transmitter and its battery being cut out, eliminates disturbing noises in the receiver which may be produced through the microphone or transmitter by vibrations of current from others near the latter talking or walking about the room or inclosure in which the same is located or from other extraneous sources, and thus leave the ear of the operator undisturbed and sensitive to the reception of incoming messages.

In the drawings, Figure 1 is a top plan view of a switch or cut-out embodying the features of the invention and shown connected up to the main line, receiver, transmitter, or microphone and battery. Fig. 2 is a side elevation of the switch or cut-out.

The numeral 1 designates a non-metallic base having movably disposed thereon a con tact-plate 2 of suitable dimensions and located adjacent to one end of the base. Contactsprings 3, 4, and 5 are terminally secured to the base and intermediately held by screws or other analogous means engaging the base, said springs being bent or projected upwardly high enough to engage the contact-plate 2 at their free ends. The contact plate is movably held in place by means of a large headed or shouldered screw 6, which extends through an elongated slot 7 in the plate and is terminally screwed into the base 1. A rod 8 movably extends through one end of the base and is secured to the plate 2, the base having an upright extension or flange 1 to receive the rod. This rod is provided with a knob or head 9, and between the latter and the extension or flange 1 a coiled spring 1.0 surrounds the rod and operates to restore the latter and the contact-plate 2 to normal position. The plate 2 is normally held in contact with the extension or flange 1" at one end and at the opposite extremity is grooved to receive a transversely-extending strip 11, of hard rubber or other insulating material, upon which the contact-springs 3 and 5 normally rest, the contact-spring 4 bearing upon the plate 2 and in electric contact therewith, the relative position of these springs changing when the plate is moved to and fro, which is accomplished by shifting the plate 2 in one direction by pressing on the knob 9 of the rod 8, and when pressure is relieved from the knob and rod the plate is returned to its normal position by the spring 1.0. The switch or cut-out means is connected to a telephone receiver, transmitter, or microphone, an induction coil or coils, and a local battery, which will be particularly referred to in designating the circuits.

The circuit connections are as follows: The main line 15 entering the switch is connected to the plate 2, as at 13, or otherwise, and when the switch is in condition for receiving the circuit is continued from the plate to the contact-spring 4, thence to a receiver 14, and from the latter to the line-out, if a metallic circuit is employed, or to the ground, the springs 3 and 5 under such arrangement resting upon the insulated portion of the plate or the strip 11 and the circuits therethrough are open. In sending position, or when the knob 9 and rod 8 are pressed inwardly, to shift the plate 2 the circuit is from the main line to the point 13 on the plate, through the spring 3 to the secondary wire of the induction coil or coils C to the line-out or return portion of the line-wire 15 or ground, the local-battery circuit being closed from the battery 17 through the primary wire of the induction coil. or coils 18, wire 20 to spring 5, plate 2, wire 2-1 transmitter 22 23, wire 24, and by the latter back to the battery 17.

By this means it will be seen that the disadvantages heretofore noted as to side tones or disturbing noises either in receiving or transmitting a message by telephonic organi zations are overcome, and owing to the simplicity of the switch mechanism it can be installed in a telephonic circuit or circuits of any character at a minimum expense and with material advantages in telephonic communication.

Having thus fully described the invention, what is claimed as newis- 1. A switch or cut-out for telephones and circuits connected therewith, consisting of a slidable conducting member having an insulating medium therein, an insulating-base supporting said member, and a series of conducting devices terminally extending over said member, a part of said conductin devices being normally in engagement with the insulating medium and the remaining portion normally in contact with the member, the conducting devices being connected up to the line telephonic instruments, and localbattery circuit including the primary and secondary of an inductorium.

2. A switch or cut-out for telephones and circuits connected therewith, consisting of an insulating-base, a slidable conducting mem her on the base having an insulating medium therein, and a series of yielding conducting devices, a part of the conducting devices being normally in contact with the insulating medium and the remaining portion engaging the member and said devices connected up to the several telephonic and line circuits.

3. A switch or cut-out for telephone and circuits connected therewith and controlling a single receiver and a transmitter at each station, having a movable element with a non-conducting member, and independent resilient means connected to the transmitter and receiver and normally in contact with said non-conducting member, said element being operative with relation to the resilient means to cut out the transmitter and receiver in alternation as well as the corresponding circuits therefor in receiving and sending messages.

4. A switch or cut-out for telephones and circuits connected therewith, having a slidable conducting member with an insulating medium therein, means for returning said conducting member automatically to normal position, and conducting devices engaging the insulating medium and the member and respectively connected to a line, receiver, transmitter, and accessories to the latter.

5. The combination with a line-wire, telephonic instruments and their local accessories, of a single switch organization or cutout including yielding elements, and a shiftable device with a non-conducting portion and having a partially-automatic operation and continually engaging the yielding elements for controlling both the transmitter and receiver and normally holding the receiver in the line and cutting out the transmitter and operative to a reverse position to cut out the receiver and throw the transmitter into line.

6. A switch or cut-out for telephones and circuits connected therewith, consisting of an insulating base or support, a conducting member movable on the said base and having an actuating-rod cooperating therewith, the conducting member being provided with an insulating strip thereon, means for automatically returning the conducting member to normal position, aseries of contact-springs secured to the base and having their free ends movably extending over the conducting member, a part of the contact-springs being normally in contact with the insulating strip of the conducting member, and electrical connections and accessories between the mem ber, springs, telephonic instruments and accessories and the line.

7. A switch or cut-out for telephones and circuits connected therewith, consisting of an insulating support, a conducting member movably mounted on said support and having an insulating medium, a series of resilient conducting devices having free ends movably engaging the member, two of the conducting devices being normally in engagement with the insulating medium, a main to a line or ground and to the remaining conline connected to the member, a telephone ducting devices normally in engagement with receiver connected to the conducting device the insulating medium.

normally out of engagement with the insu In testimony whereof I have hereunto set 15 5 lating medium and to the line or ground, a my hand in presence of two subscribing wittransmitter connected to the said member nesses.

and to a local-battery circuit and an induc- I I torium having the primary connected to the CHARLES ADAMS-RANDALL battery-circuit and one of the conducting de- Witnesses:

1o vices normally in engagement with the insu- HENRY MEISOLL,

lating medium, and the secondary attached H. W. MOWREY. 

